What do these ranks mean? ORBIC's ranking definitions

Yuma Skipper

Yuma Skipper

Ochlodes yuma

List 2S2
Woodhouse's Toad

Woodhouse's Toad

Anaxyrus woodhousii

List 2S2
Northern Leopard Frog

Northern Leopard Frog

Lithobates pipiens

List 2S1
Winged Floater

Winged Floater

Anodonta nuttalliana

List 3S2?
Oregon Floater

Oregon Floater

Anodonta oregonensis

List 2S3?

Horned Grebe

Podiceps auritus

List 2S2B,S5N
Western Ridged Mussel

Western Ridged Mussel

Gonidea angulata

List 1S2S3
Western Pearlshell

Western Pearlshell

Margaritifera falcata

List 2S3

Shortface Lanx

Fisherola nuttalli

List 1S1S2
Brant

Brant

Branta bernicla

List 4S2N

Banded Juga

Juga newberryi

List 1S1
Barrow's Goldeneye

Barrow's Goldeneye

Bucephala islandica

List 4S3B,S3N
Bufflehead

Bufflehead

Bucephala albeola

List 2S2B,S5N
Bald Eagle

Bald Eagle

Haliaeetus leucocephalus

List 4S4B,S4N
Suckley's Cuckoo Bumblebee

Suckley's Cuckoo Bumblebee

Bombus suckleyi

List 2S1?
American Peregrine Falcon

American Peregrine Falcon

Falco peregrinus anatum

List 4S3
Western Monarch

Western Monarch

Danaus plexippus pop. 1

List 1S1S2B
Western Bumblebee

Western Bumblebee

Bombus occidentalis

List 2S2
Columbia Pebblesnail

Columbia Pebblesnail

Fluminicola fuscus

List 2S2
Mountain Quail

Mountain Quail

Oreortyx pictus

List 4S3S4
California Floater

California Floater

Anodonta californiensis

List 3S2
Black-Necked Stilt

Black-Necked Stilt

Himantopus mexicanus

List 4S3?
Forster's Tern

Forster's Tern

Sterna forsteri

List 4S3B
Columbia Cress

Columbia Cress

Rorippa columbiae

List 1S3
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